Three-unit set



Patented Sept. 15, 1925.

PAUL Hid-333$, F CHARLOTTENBURG, GERMANY, ASSKQNOI Ti.) ALLGEMEINE ELEK- i .RRICITATS GYESEILLQGHAFT, 0F BERLIN, GE-Rliiiili'fi'.

THEEE UNIT SET.

Application filed January 24, 1925.

noting current motor, is connected. to the main bus here 01 the stations that its speed is setby the speed, of the main gent-1 ator and the governor of the turbine is se for a, speed lower than the normal motor speed. 'With this arrangement under ordi 2% nary operating conditions, the motor drives the driven machine and also the rotor of the turhine, the governor of the turbine being set so that at this speed it holds closed the regulating valve for the urhine. in case ?'i$. the supply of newer to the motor "hills, how

over, then as soon as the speed drops somewhat "the governor for the turbine opens the turbine regulating valve putting the turbine into operation .to drive the driven machine. When power to the motor is restored, then it wili speed up and again take the lozid, the turbine regulating valve being closed by the turbine governor. The set will shift from motor drive to turbine. drive and heel; regain automatically. Sets of oe are now Well lznown in connec on power station auxiliaries. ll hen s. set of this type is used to drive a pump such es one of the Water pumps for the condenser the diliiculty is expeiiencer that the speed of the pump is higher when it is being driven by the motor than when it is lacing driven hy the turbine. This has the disadvantage that if the pump is arranged for the turbine drive speed then when driven. by the motor he requirement for power is essentially greater. @u the other hanch ii the pump is designed for the motor drive speed then with turbine drive, due to the lower speed. the efficiency of the pump is reduced and there is danger that the pump pressure may not he sutlicient for operation under full conditions.

eerie Ho. 4,566.

The object of the present invention is to provide an arrangement for remedying the above dilliculty and to this end there is pro vided means whereby the driven machine of a threemnit set will be operated at the same speed whether being driven by the motor or the turbine. llv this n'zczms. therefore, the speed of the driven machine will he the same whether being: driven by the motor or by the turbine.

For o consideration of what I believe to be novel and my invention, attention is directed to the accompanying description and the claims appended thereto.

in the drawing, Fig. 1 a View illustrating a system embodying my invention, and Figs. 2 and 3 are detail views in side elevation and plan respectively of the governor lever connections.

' Referring to the drawing, 1 indicates a pump which is direct connected to a. motor 2 end a turbine 13, whereby there is provided it three-unit set. Motor 2 is connected by lead wires i to hes bars 5 from which it takes power for operation. Connected to turbine 3 is an elastic fluid admission conduit 6 which may take elastic fluid from any suitable source, such as one of the boilers of a power house for ezmin ole. In conduit 6 is a manually controlled shut-oil valve 7 adopted to be opened and closed by a hand Wheel 8, and also a regulating valve 9 which is connected to a speed governor 10 and serves to regulate the admission of elastic fluid to the turbine in accordance with the speed of the turbine. The exhaust conduit of the turbine is indicated at 10. I

Valve 9 is provided with a stein 11 which projects out through the valve casing and is provided at its upper end with it socket 152 in which is located the lower endlfi of a. rod 14. On rod 14 is a stop 15 for limiting the downward movement oi the rod. The upper end of rod li terminates in a head 16 to which is connected one end of a lever 17 fulcruined one bracket arm 17?. On the other end of lever 17 is en armature 18 arranged in operative rclationto an electro j magnet 19 whichiisconnected by lead Wires 26 to the lead Wires 'which cbn iiect motor 2 hue bars Electromognet 19 is thus energized by current from the some source as that which supplies current to operate motor 2. On rod 14 beneath head 16 is a spring plug 21 and arranged between this spring plug and a stationary spring plug 22 is a compressionspring 23. Spring 23 acts in an upward direction'so that it tends to move rod 14 upward. \Vhen rod 1 1 moves upward, armature 18 is moved away from electromagnet 19 and at the same time stop 15 on rod 14 is moved away from thd' upper end of stem 11, the loose end 13 of rod 14 sliding in socket 12.

Stem 11 is connected by a lever 24 to the upper end of a link 25. The lower end of link 25 is connected to one end of an arm 26 loosely mounted on a shaft 27 carried by a post 28 mounted on the governor casing. Mounted on shaft 27 is a second arm 29 the outer end of which is connected directly to the governor spindle 30. Arms 29 and 26 are connected together by means of a spring 31, a coiled spring having'one end connected to the hub of arm 29 and the other end-connected-to a pin 32 fastened to arm 26 being illustrated in the present instance. Spring 31 is of a strength that when the turbine is drivin pump 1, it will transmit movement from t e overnor to valve 9. It will, however, yield to permit arm26 to move independently of arm 29 and governor 10 under certain conditions.

The operation is as follows -Under normal conditions, motor 2' receives electrical energy from bus bars 5 to drive pump 1. Under these circumstances, electromagnet 19 is energized and draws armature 18 upward thereby forcing rod 14 downward against the action of spring 23 to hold valve 9 closed, arm 26 being moved against the action of spring 31 to a position corrcs nding to the closed position of valve 9. peed governor l0 stands in a position corresponding approximately to the speed at which the set is running, being permitted to assume this position by reason of the yielding of spring 31. The speed governor 10 is adjusted to operate the set at the same spee as that at which it operates when driven. by motor 2.

If new the source of electrical energy to motor 2 is interrupted for any reason, then electromagnet 19 is immediately deenen gized with the result that spring 23' lifts rod 14 moving stop 15 away from the upper end of valve stem 11. Spring 31'then serves immediately to openvalve 9 to an extent corresponding tothe position. of governor 10. Governor 10 then assumes control of valve 9 to regulate the admission of elastic fluid to the turbine in the usual manner so as to maintain the speed of the set at that for whichthe governor is set, which, as already stated, is the same speed as that at which the set operates when driven by motor 2.

By this means, therefore, it will be seen that pump 1 is "driven at the same speed whether operated by motor 2 or by turbine 3.

" When electricalenergy is again supplied to motor 2, electromagnet 19 will re energized, whereby'it will raise armature 18 and force valve 9. to closed position. Motor 2 will thus automatically again take up the load. During normal operation the hand valve 7 is of course in open position as shown in the drawing.

In accordance with the provisions of the patent statutes, 1 have described the principle of operation of my invention together with the apparatus which I now consider to represent the b but I desire to be e it understood that the apparatus shown is only illustrative and that the invention-may be carried out by other means.

What I claim as new and desire to secure by Letters Patent of the United States,

l. The combination with a three-unit set comprising a turbine, an electric motor, and a driven machine, said turbine ha a governor for controlling the supply of e astic fluid to it, of means controlled by the flow of electric current to'the motor for shuttin off the supply of elastic =flnid to the tar ine.

2. A three-unit set comprising a turbine, an electric motor, and a driven machine, said turbine having a governor for'controlling the supply of elastic fluid to it, characterized by the fact that the governor is adjusted for a speed the same as that at which the motor operates the set and that means responsive to the flow of electric current to the motor is provided for normally shutting ofi the supply of elastic fluid to the turbine.

3. The combination with a three unit set comprising a turbine, an electric. motor, and a driven machine, said turbine having a regulating valve and a governor for controlling it, of means for maintainin the regulat ing valve closed to the exe usion of the speed governor when the motor is driving the set whereby the governor may be adjusted for a speed the same as that at which the motor operates the set.

4. The combination with a three-imit set' comprising a turbine, an electric motor, and a driven machine, said turbine having a regulating valve and a governor for com trolling it, of a yielding member interposed in the connections between the governorand the regulating valve and means actuated when the motor is driving the driven machine for holding the regulating valve closed.

5. The combination with a. three-unit set comprising a turbine, an electric motor, and a driven machine, said turbine having a t embodiment thereof,

on eieetromagnet connected oireuit, enfi means actuated the eiectromagnet for holding the regulating); Waive cioseci.

6. The combination with e,three-unit set comprising a turbine, an electric motor, and div -:1 machine, said turbine having a ting waive and a, governor for conit, of en eiectromagnet connected and e governor for con to the motor circuit, means actuated by the electromagnet for holding the regulating valve c10sed,.and a. yielding member interposed in the connections between the valve and governor whereby the electromagnet may close the valve without overpowering the governor.

In witness whereof, I have hereunto set my hand. this 5th day of January 1925.

- PAUL HO SEL. 

